CN112574553B - Preparation method of light-curable chrome-containing leather powder 3D printing slurry - Google Patents
Preparation method of light-curable chrome-containing leather powder 3D printing slurry Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C08J2375/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a preparation method of a photo-curable chrome-containing leather powder 3D printing slurry. The invention takes chrome-containing leather scraps and the like as raw materials, the chrome-containing leather scraps and the like are mechanically processed to be micro powder as a filler, the micro powder is uniformly mixed with a polyurethane prepolymer containing a photoinitiator, and the photoinitiator, a coupling agent, a toughening agent, a reinforcing agent, a coloring agent and the like are added to obtain the chrome-containing leather powder 3D printing slurry capable of being cured by ultraviolet light. The properties of thermodynamic stability, toughness, impact strength and the like of finished leather obtained by 3D printing and curing of the slurry can meet the use requirements of leather products. The invention provides a new method for recycling chrome-containing leather scraps and the like.
Description
Technical Field
The invention relates to a preparation method of a light-curable chrome-containing leather powder 3D printing slurry, belonging to the leather industry.
Background
China is a well-known leather-making big country, and about 140 million tons of leather-making solid wastes are generated every year, wherein the chromium-containing wastes exceed 30 million tons. 1 ton of salt wet hide can produce 200kg of finished leather while also producing about 250 kg of tanning waste, a significant portion of which is chromium containing leather waste. Chrome-containing leather scraps are mainly derived from trimming and shaving blue leather, chrome-containing leather scraps are also generated in the trimming of chrome-tanned crust leather or finished leather, and chrome-tanned crust leather buffing, chrome-tanned buffing ash and the like are also generated. The chrome-containing leather scraps contain more than 90 percent of protein and the content of chromic oxide is about 3.6 percent. The leather scraps contain heavy metal chromium (trivalent chromium). In 2008, when the ministry of environmental protection and the national development and reform Commission revised the national records of hazardous waste, the strict supervision of the waste water treatment sludge generated by the chrome tanning and retanning process by using the chrome tanning agent and the chromium-containing leather crushed aggregates generated by the leather cutting process is formally started according to the hazardous solid wastes, which greatly limits the resource utilization of the chromium-containing wastes and the development of the tanning industry. Through the multiple negotiation and communication between experts in the leather-making industry and the ministry of environmental protection, until 2016, a new edition of national hazardous waste records issued by the ministry of environmental protection definitely puts chromium-containing leather waste crushed aggregates for producing leather goods, regenerated leather or electrostatic flocking into an exemption management list, the utilization process is not managed according to hazardous waste, but the chromium-containing leather waste crushed aggregates are required to be used for producing leather goods, regenerated leather or electrostatic flocking, and policy guarantee and research direction are provided for resource recycling of chromium-containing waste.
Chromium-containing waste cannot be treated by a general landfill or incineration method, and if chromium ions permeate underground water during landfill, the influence on the environment is very large; incineration of leather may result in toxic or environmentally undesirable compounds being generated and converted to lower grade heat, which is economically unattractive. The chrome-containing leather scraps can be directly used for producing non-woven fabrics after physical defibering, can also be used as retanning filling materials, coating agents and fatting agents after degradation treatment, and can also be used as animal feeds, oil field oil gelling agents, papermaking, production fertilizers and the like. In direct application, the non-woven fabric has high defibering requirement on chromium-containing leather scraps, and a plurality of chromium-containing leather scraps (particularly fine leather scraps) can not meet the use requirement. The method of recycling after degradation has relatively complex production process and high cost, and also generates secondary pollution, thereby limiting the scale application of the method. Therefore, a high value-added utilization method which is directly and universally applicable to chrome-containing leather scraps, leather grinding ash and the like is urgently needed.
Polyurethane is a high molecular polymer with a soft segment and a hard segment structure, and the soft segment and the hard segment are adjustable, so that a material with more ideal performance can be obtained, and the polyurethane is widely applied to various fields. In the leather industry, polyurethane is used as leather auxiliary agent such as finishing agent and the like, and is also used for manufacturing synthetic leather in a large amount, the performance of the polyurethane is even similar to that of real leather, leather can be replaced in many aspects, but the air permeability of natural leather cannot be achieved due to the fact that pores and the like are not easy to control in the forming process of the polyurethane.
The 3D printing technology is an emerging rapid prototyping technology, also called additive manufacturing technology, and is a technology for constructing an object by printing layer by layer on the basis of a digital model file using an adhesive material such as powdered metal and plastic or a light-curable resin. The basic principle is laminate manufacturing, a technique of adding material layer by layer to create a three-dimensional entity. At present, printing technology is mainly applied to the fields of product prototype, mold manufacturing, artistic creation, jewelry making and the like, and replaces the traditional fine processing technology. In addition, printing technology is increasingly applied to the fields of medicine, bioengineering, construction, clothing, aviation, and the like. The photocuring 3D printing method can be roughly divided into three-dimensional lithography (SLA) and Digital Light Processing (DLP), and compared with a fused extrusion deposition modeling (FDM) printing method, the photocuring 3D printing method has the outstanding advantage that the performance of the printing paste is easier to regulate, and the FDM is usually higher in hardness and narrower in application range because the material of the FDM is usually a hot-melt material such as PLA, ABS and the like. The photocuring forming mode is also suitable for printing soft materials because the printing slurry has adjustable performance and the printed object can even be stretched and deformed, thereby greatly widening the application range of 3D printing. In addition, the 3D printing can regulate and control the micro-pore structure in the forming process, and a material with air permeability is hopeful to be obtained.
The chrome-containing leather powder is obtained by mechanically crushing chrome-containing leftover materials in the leather making process, and is a flexible and wear-resistant biological material. As a potential fiber filler substitute, the chromium-containing leather powder has the advantages of low cost, low density and small abrasion to equipment. Chrome-containing leather powder prepared from chrome-containing leather scraps and the like can be used as a filler for polyurethane printing slurry, a substitute of simulated leather can be obtained through 3D printing, and the method is a novel resource utilization method which is generally applicable to chrome-containing leather scraps (including blue leather, crust leather and finished leather), buffing ash, even waste finished leather and products and the like.
Disclosure of Invention
Aiming at the defects of large pollution, difficult treatment and poor air permeability of polyurethane synthetic leather such as chromium-containing leather scraps at present, the invention provides a preparation method of a light-curable chromium-containing leather powder 3D printing slurry. According to the method, the slurry suitable for 3D photocuring printing of various leather products is prepared by integrating the dual characteristics of accurate forming of 3D printing and leather property of chromium-containing leather powder and assisting with the attributes of photocuring, pore-forming, reinforcement, dyeing and the like. The raw materials are widely available, the forming process is controllable, the pollution problem of chromium-containing leather scraps and the like in the leather industry can be solved, and the leather product meeting individual requirements can be prepared, so that the method has a wide application prospect.
The invention is realized by the following technical measures:
1. a preparation method of a light-curable chrome-containing leather powder 3D printing slurry is characterized in that the slurry comprises the following components: 60-90 parts of polyurethane prepolymer, 0-40 parts of chrome leather powder, 0-1 part of photoinitiator, 0-3 parts of coupling agent, 5-10 parts of toughening agent, 1-10 parts of reinforcing agent and 0-3 parts of foaming agent;
2. the method for preparing a photocurable chrome-containing leather powder 3D printing paste as claimed in claim 1, wherein the polyurethane prepolymer is a polyurethane prepolymer terminated with isooctyl acrylate and hydroxyethyl acrylate;
3. the method for preparing a photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the chrome-containing leather powder is a powdery substance obtained by mechanically pulverizing wet blue leather trim scraps, crust leather buffing ash, finished leather trim scraps, chrome-containing leather product waste, and the granularity of the powdery substance is 100-1000 meshes;
4. the method of claim 1, wherein the photoinitiator is selected from the group consisting of benzil and benzoin, acetophenone and its derivatives, alpha-aminoalkylacetophenone, alpha-hydroxyalkylacetophenone, acylphosphine oxide;
5. the method of claim 1, wherein the coupling agents are silane coupling agents of vinyltriethoxysilane and 3-glycidoxypropyltriethoxysilane;
6. the method of claim 1, wherein the toughening agent is a polyolefin elastomer;
7. the method for preparing a photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the strengthening agent is one of nano silica, nano calcium carbonate, nano titanium dioxide;
8. the process for preparing a photocurable chrome-containing leather powder 3D printing paste as claimed in claim 1, wherein the foaming agent is azodicarbonamide;
9. the method for preparing the photocurable chrome-containing leather powder 3D printing slurry as recited in claim 1, wherein the slurry can be placed in a trough of a photocuring 3D printer and printed according to a pre-established model, and a photocuring light source is a high-pressure mercury lamp with the power of 1.0-8.0 KW and capable of generating ultraviolet light with the wavelength of 300-400 nm;
10. the preparation method of the photocurable chrome-containing leather powder 3D printing paste as claimed in claim 1, which is characterized by comprising the following specific preparation steps:
(1) preparing chrome-containing leather powder: adding chrome-containing leather scraps and the like into an ultrafine grinder, and grinding into powder with the granularity of 100-1000 meshes;
(2) pretreatment of chrome-containing leather powder: adding 50 parts by weight of chrome-containing leather powder and 1-5 parts by weight of silane coupling agent into a container filled with 100-1000 parts by weight of dimethylbenzene, carrying out ultrasonic treatment for 20-40 min, stirring and reacting for 10-14 hours at 115-125 ℃ in an oil bath, and then cooling to 45-55 ℃;
(3) adding 3-5 parts by weight of glycidyl methacrylate, reacting at normal temperature for 22-26 hours, distilling under reduced pressure to remove xylene, and drying in vacuum to obtain pretreated chrome-containing leather powder;
(4) adding 60-90 parts of polyurethane prepolymer, 0-40 parts of chrome-containing leather powder, 0-1 part of photoinitiator, 0-3 parts of coupling agent, 5-10 parts of toughening agent, 1-10 parts of reinforcing agent and 0-3 parts of foaming agent into a reaction container, and stirring at room temperature for 1.5-2.5 hours to mix uniformly to obtain printing paste.
The invention has the outstanding characteristics that:
(1) the controllability is good: grafting a silane coupling agent and glycidyl methacrylate onto the surface of chromium-containing leather powder by using a solvent method; preparing a series of cured 3D printing pastes with different performances and genuine leather properties by utilizing the adjustable properties of the soft and hard polyurethane sections; and 3D printing is utilized to regulate and control printing precision and regulate and control pores in the forming process.
(2) The chrome-containing leather powder has good binding performance with a substrate: the silane coupling agent promotes the dispersing ability of the chromium-containing leather powder in a polyurethane matrix, and the grafted glycidyl methacrylate can generate stronger covalent interaction with polyurethane in the curing stage, so that the leather powder migration preventing ability is realized.
(3) The resource utilization degree is high: the raw materials mainly comprise polyurethane and chrome-containing leather powder, the preparation process of the polyurethane is mature, and the chrome-containing leather powder is prepared from non-valuable leftover waste of a tanning factory, is used for preparing printing slurry, and is a high-efficiency economic treatment method for changing waste into valuable.
(4) The application range is wide. The method can be widely applied to blue wet leather trimming scraps, blue wet leather even-shaving scraps, crust leather trimming scraps, crust leather buffing ash, finished leather trimming scraps, chrome-containing leather product wastes and the like.
(5) The method can be customized: the traditional manufacturing industry adopts the basic 'subtractive manufacturing', and 3D printing is additive manufacturing, and can be used for personalized customization of patients with specific requirements such as flat feet and the like.
(6) The method has the advantages of low production cost, simple production process and easy realization of industrialization.
(7) The slurry obtained by the method can break through the use limitation of the traditional leather products as sheet materials after 3D printing, and can be made into various leather products with complex structures which can meet the use personalized requirements according to the requirements.
Detailed Description
While the invention has been described in detail in the following for the purpose of illustration, it is to be understood that this invention is not limited thereto but is intended to cover various modifications and changes therein which may be made by those skilled in the art without departing from the spirit and scope of the invention.
Application example 1
(1) Preparing chrome-containing leather powder: adding chromium-containing scraps into an ultrafine grinder, and grinding the chromium-containing scraps into powder with the granularity of 200 meshes;
(2) pretreatment of chrome-containing leather powder: weighing 100g of chromium-containing leather powder and 2g of silane coupling agent, adding the mixture into a three-necked flask filled with a proper amount of dimethylbenzene, carrying out ultrasonic treatment for 30min, stirring and reacting for 12 hours at the temperature of 120 ℃ in an oil bath, and cooling to 50 ℃;
(3) adding 5g of glycidyl methacrylate, reacting for 24 hours at normal temperature, distilling under reduced pressure to remove xylene, drying in vacuum, and storing in a sealed manner for later use;
(4) adding 300g of polyurethane prepolymer, 100g of chrome-containing leather powder, 5g of alpha-aminoalkylacetophenone, 15g of KBE-1003, 25g of POE-DF610, 5g of nano-silica and 15g of azodicarbonamide into a reaction container, stirring for 2 hours at room temperature to mix uniformly, and sealing and storing for later use;
(5) and (3) placing the slurry into a material tank of a photocuring 3D printer, and printing according to a pre-established model.
Application example 2
(1) Preparing chrome-containing leather powder: adding chromium-containing scraps into an ultrafine grinder, and grinding the chromium-containing scraps into powder with the granularity of 500 meshes;
(2) pretreatment of chrome-containing leather powder: weighing 1kg of chrome-containing leather powder and 20g of silane coupling agent, adding the mixture into a reaction kettle filled with a proper amount of dimethylbenzene, carrying out ultrasonic treatment for 20min, stirring and reacting for 10 hours under the condition of 115 ℃ oil bath, and cooling to 45 ℃;
(3) adding 50g of glycidyl methacrylate, reacting at normal temperature for 26 hours, distilling under reduced pressure to remove xylene, drying in vacuum, and storing in a sealed manner for later use;
(4) adding 4kg of polyurethane prepolymer, 1kg of chrome-containing leather powder, 30g of alpha-hydroxyalkylacetophenone, 100g of KBM-403, 200g of POE-30000, 40g of nano titanium dioxide and 120g of azodicarbonamide into a reaction container, stirring at room temperature for 1.5h to mix uniformly, and sealing and storing for later use;
(5) and (3) placing the slurry into a material tank of a photocuring 3D printer, and printing according to a pre-established model.
Application example 3
(1) Preparing chrome-containing leather powder: adding chromium-containing scraps into an ultrafine grinder, and grinding the chromium-containing scraps into powder with the granularity of 1000 meshes;
(2) pretreatment of chrome-containing leather powder: weighing 5Kg of chromium-containing leather powder and 100g of silane coupling agent, adding the chromium-containing leather powder and the silane coupling agent into a reaction kettle filled with a proper amount of dimethylbenzene, carrying out ultrasonic treatment for 30min, stirring and reacting for 10 hours at 125 ℃ in an oil bath, and cooling to 55 ℃;
(3) adding 300g of glycidyl methacrylate, reacting at normal temperature for 22 hours, distilling under reduced pressure to remove xylene, drying in vacuum, and storing in a sealed manner for later use;
(4) adding 20kg of polyurethane prepolymer, 5kg of chrome-containing leather powder, 200g of alpha-hydroxyalkylacetophenone, 500g of KBM-403, 1kg of POE-8800D, 40g of nano-dioxy calcium carbonate and 120g of azodicarbonamide into a reaction container, stirring at room temperature for 2.5h to mix uniformly, and sealing and storing for later use;
(5) and (3) placing the slurry into a material tank of a photocuring 3D printer, and printing according to a pre-established model.
Claims (9)
1. A preparation method of a light-curable chrome-containing leather powder 3D printing slurry is characterized by comprising the following specific preparation steps:
(1) adding the chromium-containing leather scraps into an ultrafine grinder, and grinding the chromium-containing leather scraps into powder with the granularity of 100-1000 meshes; adding 50 parts by weight of the powder and 1-5 parts by weight of silane coupling agent into a container filled with 100-1000 parts by weight of dimethylbenzene, performing ultrasonic treatment for 20-40 min, stirring and reacting for 10-14 hours at 115-125 ℃ in an oil bath, and then cooling to 45-55 ℃; adding 3-5 parts by weight of glycidyl methacrylate, reacting at normal temperature for 22-26 hours, distilling under reduced pressure to remove xylene, and drying in vacuum to obtain chrome-containing leather powder;
(2) adding 60-90 parts of polyurethane prepolymer, 0-40 parts of chrome-containing leather powder prepared in the step (1), 0-1 part of photoinitiator, 0-3 parts of coupling agent, 5-10 parts of toughening agent, 1-10 parts of reinforcing agent and 0-3 parts of foaming agent into a reaction container, and stirring at room temperature for 1.5-2.5 hours to mix uniformly to obtain printing slurry;
the polyurethane prepolymer is terminated by isooctyl acrylate and hydroxyethyl acrylate;
in the step (2), the use amounts of the chrome-containing leather powder and the photoinitiator are not 0.
2. The method of claim 1, wherein said chrome-containing leather shavings are blue wet leather trim shavings, blue wet leather shavings, crust leather trim shavings, crust leather buffing ash, finished leather trim shavings, chrome-containing leather waste.
3. The method of preparing a photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the photoinitiator is benzil, benzoin, acetophenone, α -aminoalkylacetophenone, α -hydroxyalkylacetophenone, or acylphosphine oxide.
4. The method of claim 1, wherein the coupling agent is vinyltriethoxysilane and 3-glycidoxypropyltriethoxysilane.
5. The method for preparing a photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the toughening agent is a polyolefin elastomer.
6. The method for preparing the photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the reinforcing agent is one of nano silica, nano calcium carbonate and nano titanium dioxide.
7. The process for preparing a photocurable chrome-containing leather powder 3D printing paste as recited in claim 1, wherein the blowing agent is azodicarbonamide.
8. A photocurable chrome-containing leather powder 3D printing paste, characterized by being prepared by the preparation method of any one of claims 1-7.
9. The application of the photocurable chrome-containing leather powder 3D printing paste as recited in claim 8, wherein the photocurable chrome-containing leather powder 3D printing paste is placed in a trough of a photocurable 3D printer and is printed according to a pre-established model, a light source of photocuring is a high-pressure mercury lamp, the power is 1.0-8.0 KW, and the wavelength is 300-400 nm.
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| CN114292460A (en) * | 2021-11-15 | 2022-04-08 | 四川大学 | Method for 3D printing of personalized leather product by using chromium-containing leather scraps and waste wool |
| CN115305728A (en) * | 2022-08-10 | 2022-11-08 | 清远市齐力合成革有限公司 | Automatic production line and production method of polyurethane synthetic leather and product thereof |
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